Today at work (on a Saturday yet!) I happened across sheets of chipboard 4 foot square (1.2 meters) .030" thick (.8mm). And then I noticed some stuff of much nicer consistancy but slightly thinner (.025"/6.4mm). And this stuff is going in the trash every single day and I never noticed it. Was able to cut up about 100 9" x 12" sheets. I should be set for a while.